EP0278229B1 - Device for electrically contacting electromagnetically activated fuel injectors - Google Patents

Device for electrically contacting electromagnetically activated fuel injectors Download PDF

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Publication number
EP0278229B1
EP0278229B1 EP88100240A EP88100240A EP0278229B1 EP 0278229 B1 EP0278229 B1 EP 0278229B1 EP 88100240 A EP88100240 A EP 88100240A EP 88100240 A EP88100240 A EP 88100240A EP 0278229 B1 EP0278229 B1 EP 0278229B1
Authority
EP
European Patent Office
Prior art keywords
plug
contact
strip
fuel injection
plugs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88100240A
Other languages
German (de)
French (fr)
Other versions
EP0278229A3 (en
EP0278229A2 (en
Inventor
Udo Ing. Hafner (Grad.)
Ferdinand Dipl.-Ing. Reiter (Ba)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE3725980A external-priority patent/DE3725980C2/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0278229A2 publication Critical patent/EP0278229A2/en
Publication of EP0278229A3 publication Critical patent/EP0278229A3/en
Application granted granted Critical
Publication of EP0278229B1 publication Critical patent/EP0278229B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R25/00—Coupling parts adapted for simultaneous co-operation with two or more identical counterparts, e.g. for distributing energy to two or more circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/21—Engine cover with integrated cabling

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • Fuel injection valves are already known in which the electrical contact is made by means of individual plugs which are successively plugged onto each assigned fuel injection valve.
  • Such connectors are known from document DE-A-3 220 090. This means a considerable effort in the assembly of the fuel injection valves on the internal combustion engine, since the fuel injection valves are first inserted into the individual openings provided on the individual intake pipes of the cylinders of the internal combustion engine and then by individual clamping claws, the fuel injection valves are axially fixed in these openings. Subsequently, the plug which is electrically conductively connected to the electronic control unit is plugged into each fuel injection valve.
  • the document US-A-4 570 601 discloses a device in which the supply of current to the fuel injection valves is carried out by means of a single contact strip. Both plug contact elements for contacting each individual valve and plug contact elements for connecting the control unit and electrical lines are mounted on this contacting strip. However, this device only discloses a contact strip that includes both power and fuel lines, which requires tighter tolerances.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the electrical contacting of several fuel injection valves by means of the Contacting strip arranged plugs takes place simultaneously in one operation and, at the same time, a force can be exerted on the fuel injection valves in the axial direction, by means of which the fuel injection valves can be fixed in the axial direction.
  • the fuel injection valves can also be plugged into the plugs of the contact strip and then inserted together into the openings on the individual intake pipes or cylinders on the cylinder head of the internal combustion engine by means of the contact strip.
  • plugs from a first and second plug part and to connect the plug parts to one another such that one of the plug parts reaches through a plug opening in the contact strip and the contact strip is held between the two plug parts.
  • FIG. 1 shows a first embodiment of an inventive 2 shows a section along the line II-II in FIG. 1
  • FIG. 3 shows a section along the line III-III in FIG. 1
  • FIG. 4 shows a second exemplary embodiment of a contacting bar designed according to the invention in a sectional top view
  • FIG. 5 shows a third 6 shows a section along the line VI-VI in FIG. 5
  • FIG. 7 shows a section along the line VII-VII in FIG. 5
  • FIG. 8 shows a partial illustration of the second contact elements on a changed scale
  • FIG. 9 10 shows a section along the line XX in FIG. 9,
  • FIG. 11 shows a section along the line XI-XI in FIG. 9,
  • FIG. 12 shows a partial view of a band-shaped contact rail with a flat plug.
  • the fuel injection valve In the first exemplary embodiment of a device for the electrical contacting of electromagnetically actuated fuel injection valves 1 according to FIGS. 1 to 3, four fuel injection valves 1 are inserted into stepped receiving openings 2 of individual intake pipes or on cylinders 3 immediately before the inlet valves of mixture-compression-ignition spark-ignition internal combustion engines.
  • the fuel injection valve Averted from the injection end of the fuel injection valve 1, not shown, the fuel injection valve has a head end 4, from which contact pins 5, generally two, protruding as first electrically conductive contact elements protrude.
  • the contact pins 5 extend approximately in the direction of the longitudinal axis 6 of the fuel injection valve 1 and are electrically conductively connected to a magnet coil, not shown.
  • the contact pins 5 preferably have a rectangular cross section.
  • each Fuel injector 1 is assigned a connector 9.
  • the fuel injection valves 1 and the control unit 8 are components of a fuel injection system in which the quantity of fuel injected via the fuel injection valves 1 is dependent on the operating parameters of the internal combustion engine, such as intake air quantity 10, load 11, temperature 12 and others, which are input as a function of the electronic control unit 8.
  • the plugs 9 are arranged on a common contact strip 14, which can be made completely flat or, for example, have a trough-like shape according to the drawings and can be made of sheet metal.
  • an edge region 15 on the circumference of the entire contact strip is bent approximately at right angles to a flat inner region 16.
  • This bent edge region 1 can also only extend over a partial region of the circumference of the contact strip, for example only over one or both edge regions on the narrow sides of the contact strip or over one or both edge regions on the longitudinal sides of the contact strip 14.
  • the contact strip can be made of metal, plastic or Ceramic exist and has mounting holes 17 through which screws 18 can be inserted and screwed into the wall of the internal combustion engine for fastening the contact strip to the internal combustion engine.
  • the contact strip 14 shown has an elongated straight shape, but the contact strip could also have a curved shape in the longitudinal direction if the fuel injection valves are not arranged in a line one behind the other.
  • the contact strip 14 shown has four plugs for four individual fuel injection valves 1 arranged at a distance from one another in the axial direction of the contact strip.
  • Electrical lines 20 lead to the individual plugs 9, which either start from a connecting plug 21 shown in dashed lines and arranged on the contact strip, or lead to a cable harness 22 which either has a plug connection (not shown) or is directly connected to the electronic control unit 8.
  • a plug connection with a mating connector 23, shown in dashed lines, which is connected to the cable harness 22, can likewise be produced via the connector plug 21.
  • the axial distances and the position of the connectors 9 to one another on the contact strip depend on the distances and the position of the fuel injection valves 1 on the internal combustion engine.
  • each plug 9 is formed from a first plug part 25 and a second plug part 26.
  • the second plug part 26 has an extension 27 extending in the direction of the longitudinal axis 6, which extends through a plug opening 28 in the inner region 16 of the contact strip 14 and projects into a receiving opening 29 of the first plug part 25 arranged on the other side of the contact strip 14.
  • the first plug part 25 has latching lugs 30 which protrude into the interior of the receiving opening 29 and which engage during assembly with the second plug part 26 in a latching groove 31 on the shoulder 27 of the second plug part 26 and thus the first plug part 25 and the second Fix plug part 26 to each other in the axial direction.
  • latching lugs on the extension 27 and the latching groove could be formed on the first plug part 25.
  • first plug part 25 and the second plug part 26 are advantageously made of plastic and adhere or clamp the contact strip between them 14, for which purpose the two connector parts protrude beyond the connector opening 28, with play possibly being present in the axial direction between the connector parts and the contact strip.
  • second electrically conductive contact elements 37 are cast in at one end, the other ends of which, lying inside the connector sealing ring, protrude into the receiving opening 29 and are aligned with the contact pins 5, which partially encompass them to produce an electrically conductive connection.
  • the second electrically conductive contact elements are connected within the first plug part 25 in an electrically conductive manner to one electrical line 20 each and are advantageously designed at other ends as so-called flat plugs.
  • the second plug part 26 with an overlapping opening 38, for example, of rectangular design, engages around the head end 4, which is also at least partially provided with a rectangular cross section, and is supported with its plug end face 39 on a collar 40 of the fuel injection valve 1, which on the other hand in this way bears against an edge 41 of the stepped receiving opening 2 is pressed, whereby the fuel injection valve is fixed in the axial direction.
  • the collar 40 can also be formed on an intermediate ring 42, as shown in FIG. 3, which, with a central opening 43, lies around the head end 4 on the fuel injection valve 1.
  • the contact pins 5 protrude from one side and the flat plug 37 from the other side into a passage opening 44, which extends from the overlap opening 38 to the end face 35 of the extension 27, and provide an electrically conductive one Connector.
  • the through openings 44 are at approximately the same distance from one another as the contact pins 5.
  • the seal between the plug 9 and the receiving opening 2 can be provided by a sealing ring 45 which is inserted into a circumferential groove 52 of the second connector part 26 and on the wall of the receiving opening 2 is under voltage.
  • the parts which remain the same and have the same effect as in the first exemplary embodiment according to FIGS. 1 to 3 are identified by the same reference numerals.
  • the contact strip 46 and the plug 9 are made in the second embodiment of Figure 4 as a common part made of plastic, for example as an injection molded part.
  • the contact bar 46 is also elongated. As shown in FIGS. 6 and 7, for example, different cross sections of the contact strip 46 are possible.
  • the contacting strip 46 can have a circumferential, flat base plate 47, which in its central region merges into clamping sections 48 and plug sections 49.
  • the clamping sections 48 and the plug sections 49 each rise above the base plate 47 on the side facing away from the fuel injection valves 1.
  • each clamping section 48 is trough-shaped, with a cruciform clamping base 50 facing the base plate 47, which, with sufficient strength, requires as little material as possible and through the fastening holes 17 of which the screws 18 for clamping the contact strip 46 can be inserted.
  • The, for example, cross-shaped clamping base 50 can have a circular central region that receives the fastening hole 17, from which four webs, for example, run in a star shape, with the formation of recesses 51 toward the base plate 47.
  • Each trough-shaped clamping section 48 has side walls 53 extending from the base plate 47, in which at least partially slots 54 extending from the end face 60 of the ledge are recessed, through which electrical lines 20 lead to the individual plugs 9 or second electrically conductive contact elements 37 of the plugs 9 .
  • the electrical lines 20 can be designed as round wire or band-shaped contact rails, as is shown, for example, in cross section in FIGS. 6 and 8. In the exemplary embodiment according to FIG. 4, the electrical lines 20 are connected in such a way that the individual fuel injection valves 1 are electrical are connected in parallel, so that all fuel injection valves 1 contacted by the contacting strip 46 can be excited simultaneously. As already explained for FIG.
  • the electrical lines 20 can be led out of the contact strip 46 as individual lines and lead to the electronic control unit 8 as a cable harness 22, or according to the illustration in FIG. 5 and the description of FIG. 1 with one on the contact strip 46 molded connector 21 are connected.
  • the band-shaped contact rails 20, which also serve as electrical lines, can be formed in the region of the plugs 9 as second contact elements 37 in the form of flat plugs, in that this region of the contact rail is shaped into a flat plug in a bending process, the cross section of which has a U-shape with legs, which are open in the direction of the contact pins 5 and partially grip them under tension.
  • the contact pin 5 is expediently provided with a rectangular cross section.
  • the flat plug facing away from the open end of the flat plug 37, has a push-through opening 55, which is expediently also rectangular in shape in the case of a rectangular contact pin 5 and enables the contact pin 5 to be pushed through, the push-through opening 55 being designed in the longitudinal direction to be sufficiently longer than the contact pin, by sufficient Game available as tolerance compensation.
  • the electrical lines 20 can also be guided in line grooves 56 of the base plate 47 (see FIG. 6). Support webs 57 running from the base plate 47 to the side walls 53 or to the plug 9 ensure sufficient rigidity of the contact strip 46.
  • FIG. 7 shows, for example, a cross section through a plug section 49, which rises from the base plate 47 in a pot-shaped manner, like the side walls 53, and with a bulge 59 the head end 4 of the Grips around fuel injection valve 1, which projects into the blind hole-shaped overlap opening 38 of the bulge 59 and engages there with its contact pins 5 in the tabs 37, which are connected to the electrical lines 20 and held in the plugs 9 within the overlap opening 38.
  • the electrical lines can likewise be routed in the region of the plug sections 49 in slots 54 or line grooves 56 formed in the walls of the plug section.
  • the base plate 47 has on its ledge end face 60 facing away from the bulge 59, a recess 61 with which the contact strip 46 engages over the collar 40 and, as already described above for the first exemplary embodiment, thereby braces the fuel injection valve 1 in the axial direction for fixing.
  • the depression 61 like an annular groove 62 formed on the strip end face 60, is open toward the individual intake pipe or cylinder 3.
  • a sealing ring 63 is inserted, which extends in the base plate 47 with the contact strip 46 screwed by means of the screws 18 between the contact strip 46 and the individual intake pipes or cylinders 3 to the fuel injection valves 1.
  • the third exemplary embodiment of a contacting strip 46 uses the same reference symbols for identical and identical parts as have been used for the previous exemplary embodiments.
  • the contact strip 46 which is also made of plastic together with the plugs 9 and which also has cross sections corresponding to FIGS. 6 and 7 in the cross sections of the clamping section 48 and plug section 49, differs only in the attachment of a connecting plug 21 and the routing of the electrical lines 20 from the second exemplary embodiment according to FIG. 4.
  • the electrical lines 20 are guided in such a way that those contacted by the contact strip 46
  • Fuel injection valves 1 can be excited in succession or in groups by the electronic control unit.
  • the contact strip 70 is made of plastic, for example as an injection molded part.
  • the contact strip 70 is elongated and has spaced-apart molded hoods 71 which each have a blind hole-shaped connector opening 72 forming a housing for each connector 9.
  • the hoods 71 protrude from a base plate 73 of the contact strip 70.
  • a stiffening rib 74 extends between the hoods 71 in the longitudinal direction of the contacting strip 70.
  • a longitudinal groove 76 extends inside the contacting strip 70 towards the strip end face 75, with which the contacting strip rests on the internal combustion engine, which the individual Plug openings 72 cuts and connects together.
  • the plug openings 72 are open to the longitudinal groove 76 and the strip end face.
  • a sealing ring 63 can be arranged in an annular groove 62 of the strip end face 75, which is supported on a suitable contact surface of the internal combustion engine, so that the longitudinal groove 76 is essentially sealed off from the outside.
  • the contacting strip 70 is fastened to the internal combustion engine by means of screws 18.
  • the contacting strip has mounting holes 17 at a distance from one another, into which a centering bushing 78 can be inserted, which projects into a centering opening 79 of the internal combustion engine with tight play.
  • the screw 18 is inserted into a screw opening 80 of the centering bushing 78 and screwed to a threaded bore 81 of the internal combustion engine.
  • four screws 18 are provided on the contact strip and four plugs 9.
  • the strip end face 75 can serve to engage the collar 40 of each fuel injection valve 1 and to brace each fuel injection valve in the axial direction.
  • each contact rail 85 is connected to the electronic control unit via the connector plug 21.
  • each contact rail 85 is bent out of its band plane to form individual arches 86, so that each arch 86 projects into a plug opening 72.
  • Each arch 86 can be provided with compensating arches 87 which ensure a certain length compensation.
  • each bend 86 is electrically conductively connected to a flat plug 37 serving as a second contact element, e.g. welded, jammed or soldered.
  • each connector opening 72 an insert body 88 is inserted to form a connector 9, which can be connected to a hood 71 by a screw or a snap connection.
  • FIG. 9 only one insert body 88 is shown in the second connector opening 72 from the left, and in FIG. 10, only one insert body is shown in the first and the second connector opening 72 from the left.
  • Each insert body 88 has guide grooves 89 which extend approximately parallel to the longitudinal axis 6 of the plug and each lead an arc 86 of the contact rails 85.
  • each insert body 88 has 37 holding openings 90 corresponding to the required number of tabs, which each insert body 88 in the direction of the connector longitudinal axis penetrate the longitudinal axis 6 and serve to hold the tab 37.
  • two holding openings 90 are provided for receiving a flat plug 37 in the insert body 88, so that each contact pin 5 of each fuel injection valve 1 can be electrically connected to one of the flat plugs 37.
  • the contacting strip 70 enables the simultaneous establishment of a plug connection between all fuel injection valves 1 and the plugs 9.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung geht aus von einer Vorrichtung nach der Gattung des Hauptanspruchs. Es sind bereits Kraftstoffeinspritzventile bekannt, bei denen die elektrische Kontaktierung durch einzelne Stecker erfolgt, die nacheinander auf jedes zugeordnete Kraftstoffeinspritzventil gesteckt werden. Solche Stecker sind aus dem Dokument DE-A-3 220 090 bekannt. Dieses bedeutet einen erheblichen Aufwand bei der Montage der Kraftstoffeinspritzventile an der Brennkraftmaschine, da zunächst die Kraftstoffeinspritzventile in die einzelnen dafür vorgesehenen Öffnungen an den Einzelansaugrohren der Zylinder der Brennkraftmaschine eingesteckt werden und danach durch einzelne Spannpratzen, die axiale Fixierung der Kraftstoffeinspritzventile in diesen Öffnungen erfolgt. Anschließend daran wird auf jedes Kraftstoffeinspritzventil der mit dem elektronischen Steuergerät elektrisch leitend verbundene Stecker gesteckt. Das Dokument US-A-4 570 601 offenbart eine Vorrichtung bei dem die Zuleitung von Strom zu den Kraffstoffeinspritzventilen mittels einer einzigen Kontaktierungsleiste erfolgt. Auf dieser Kontaktierungsleiste sind sowohl Steckkontaktelemente für die Kontaktierung jedes einzelnen Ventils als auch Steckkontaktelemente für den Anschluß des Steuergeräts und elektrische Leitungen montiert. Dieser Vorrichtung offenbart jedoch Lediglich eine Kontaktierungsleiste die sowohl Strom- wie auch Treibstoffleitungen umfaßt, was engere Toleranzen erfordert.The invention relates to a device according to the preamble of the main claim. Fuel injection valves are already known in which the electrical contact is made by means of individual plugs which are successively plugged onto each assigned fuel injection valve. Such connectors are known from document DE-A-3 220 090. This means a considerable effort in the assembly of the fuel injection valves on the internal combustion engine, since the fuel injection valves are first inserted into the individual openings provided on the individual intake pipes of the cylinders of the internal combustion engine and then by individual clamping claws, the fuel injection valves are axially fixed in these openings. Subsequently, the plug which is electrically conductively connected to the electronic control unit is plugged into each fuel injection valve. The document US-A-4 570 601 discloses a device in which the supply of current to the fuel injection valves is carried out by means of a single contact strip. Both plug contact elements for contacting each individual valve and plug contact elements for connecting the control unit and electrical lines are mounted on this contacting strip. However, this device only discloses a contact strip that includes both power and fuel lines, which requires tighter tolerances.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die elektrische Kontaktierung mehrerer Kraftstoffeinspritzventile mittels den an der Kontaktierungsleiste angeordneten Steckern in einem Arbeitsgang gleichzeitig erfolgt und dabei auch zugleich eine Kraft in axialer Richtung auf die Kraftstoffeinspritzventile ausgeübt werden kann, durch die die Kraftstoffeinspritzventile in axialer Richtung fixierbar sind. Es können auch die Kraftstoffeinspritzventile auf die Stecker der Kontaktierungsleiste gesteckt und dann mittels der Kontaktierungsleiste gemeinsam in die Öffnungen an den Einzelansaugrohren bzw. Zylindern am Zylinderkopf der Brennkraftmaschine eingeführt werden.The device according to the invention with the characterizing features of the main claim has the advantage that the electrical contacting of several fuel injection valves by means of the Contacting strip arranged plugs takes place simultaneously in one operation and, at the same time, a force can be exerted on the fuel injection valves in the axial direction, by means of which the fuel injection valves can be fixed in the axial direction. The fuel injection valves can also be plugged into the plugs of the contact strip and then inserted together into the openings on the individual intake pipes or cylinders on the cylinder head of the internal combustion engine by means of the contact strip.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Vorrichtung möglich.Advantageous further developments and improvements of the device specified in the main claim are possible through the measures listed in the subclaims.

Vorteilhaft ist es, die Stecker aus einem ersten und zweiten Steckerteil auszubilden und die Steckerteile so miteinander zu verbinden, daß eines der Steckerteile durch eine Steckeröffnung der Kontaktierungsleiste hindurchgreift und die Kontaktierungsleiste zwischen den beiden Steckerteilen gehalten wird.It is advantageous to form the plugs from a first and second plug part and to connect the plug parts to one another such that one of the plug parts reaches through a plug opening in the contact strip and the contact strip is held between the two plug parts.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ist darin zu sehen, daß die Stecker an der aus Kunststoff gefertigten Kontaktierungsleiste ausgebildet sind.Another advantageous embodiment of the invention can be seen in the fact that the plugs are formed on the contact strip made of plastic.

Vorteilhaft ist es ebenfalls, an der Kontaktierungsleiste einen mit den zweiten elektrisch leitenden Kontaktelementen der Stecker ver bundenen Anschlußstecker anzuordnen.It is also advantageous to arrange a connected to the contact strip with the second electrically conductive contact elements of the plug connected connector.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel einer erfindungsgemäß ausgestalteten Kontaktierungsleiste in Draufsicht, Figur 2 einen Schnitt entlang der Linie II-II in Figur 1, Figur 3 einen Schnitt entlang der Linie III-III in Figur 1, Figur 4 ein zweites Ausführungsbeispiel einer erfindungsgemäß ausgestalteten Kontaktierungsleiste in geschnittener Draufsicht, Figur 5 ein drittes Ausführungsbeispiel einer erfindungsgemäß ausgebildeten Kontaktierungsleiste in geschnittener Draufsicht, Figur 6 einen Schnitt entlang der Linie VI-VI in Figur 5, Figur 7 einen Schnitt entlang der Linie VII-VII in Figur 5, Figur 8 eine Teildarstellung der zweiten Kontaktelemente in geändertem Maßstab, Figur 9 ein viertes Ausführungsbeispiel einer erfindungsgemäß ausgebildeten Kontaktierungsleiste, Figur 10 einen Schnitt entlang der Linie X-X in Figur 9, Figur 11 einen Schnitt entlang der Linie XI-XI in Figur 9, Figur 12 eine Teilansicht einer bandförmigen Kontaktschiene mit einem Flachstecker.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a first embodiment of an inventive 2 shows a section along the line II-II in FIG. 1, FIG. 3 shows a section along the line III-III in FIG. 1, FIG. 4 shows a second exemplary embodiment of a contacting bar designed according to the invention in a sectional top view, FIG. 5 shows a third 6 shows a section along the line VI-VI in FIG. 5, FIG. 7 shows a section along the line VII-VII in FIG. 5, FIG. 8 shows a partial illustration of the second contact elements on a changed scale, FIG. 9 10 shows a section along the line XX in FIG. 9, FIG. 11 shows a section along the line XI-XI in FIG. 9, FIG. 12 shows a partial view of a band-shaped contact rail with a flat plug.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Bei dem ersten Ausführungsbeispiel einer Vorrichtung zur elektrischen Kontaktierung von elektromagnetisch betätigbaren Kraftstoffeinspritzventilen 1 nach den Figuren 1 bis 3 sind vier Kraftstoffeinspritzventile 1 in gestufte Aufnahmeöffnungen 2 von Einzelansaugrohren oder an Zylindern 3 unmittelbar vor den Einlaßventilen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen eingesetzt. Dem nicht dargestellten Einspritzende des Kraftstoffeinspritzventiles 1 abgewandt weist das Kraftstoffeinspritzventil ein Kopfende 4 auf, aus dem als erste elektrisch leitende Kontaktelemente ausgebildete Kontaktstifte 5, in der Regel zwei, herausragen. Die Kontaktstifte 5 erstrecken sich etwa in Richtung der Längsachse 6 des Kraftstoffeinspritzventiles 1 und sind elektrisch leitend mit einer nicht dargestellten Magnetspule verbunden. Vorzugsweise weisen die Kontaktstifte 5 einen rechteckförmigen Querschnitt auf. Die elektrische Verbindung jedes einzelnen Kraftstoffeinspritzventiles mit einem elektronischen Steuergerät 8 erfolgt über Stecker 9, wobei jedem Kraftstoffeinspritzventil 1 ein Stecker 9 zugeordnet ist. Die Kraftstoffeinspritzventile 1 und das Steuergerät 8 sind Komponenten einer Kraftstoffeinspritzanlage, bei der die Dosierung der über die Kraftstoffeinspritzventile 1 eingespritzten Kraftstoffmenge in Abhängigkeit von dem elektronischen Steuergerät 8 eingegebenen Betriebskenngrößen der Brennkraftmaschine wie Ansaugluftmenge 10, Last 11, Temperatur 12 und andere erfolgt. Gemäß der Erfindung sind die Stecker 9 an einer gemeinsamen Kontaktierungsleiste 14 angeordnet, die ganz flach ausgebildet sein oder entsprechend den Zeichnungen eine beispielsweise wannenförmige Gestalt haben und aus Blech ausgebildet sein kann. Bei der wannenförmigen Gestalt der Kontaktierungsleiste 14 ist ein Randbereich 15 am Umfang der gesamten Kontaktierungsleiste etwa rechtwinklig gegenüber einem ebenen Innenbereich 16 abgebogen. Dieser abgebogene Randbereich 1 kann sich auch nur über einen Teilbereich des Umfanges der Kontaktierungsleiste erstrecken, beispielsweise nur über einen oder beide Randbereiche an den Schmalseiten der Kontaktierungsleiste oder über eine oder beide Randbereiche an den Längsseiten der Kontakierungsleiste 14. Die Kontaktierungsleiste kann aus Metall, Kunststoff oder Keramik bestehen und weist Befestigungslöcher 17 auf, durch welche Schrauben 18 gesteckt und zur Befestigung der Kontaktierungsleiste an der Brennkraftmaschine in die Wandung der Brennkraftmaschine eingeschraubt werden können. Die dargestellte Kontaktierungsleiste 14 hat eine längliche gerade Form, die Kontaktierungsleiste könnte jedoch ebenfalls in Längsrichtung eine gebogene Form aufweisen, falls die Kraftstoffeinspritzventile nicht in einer Linie hintereinander angeordnet sind. Die dargestellte Kontaktierungsleiste 14 weist vier in axialer Richtung der Kontaktierungsleiste mit Abstand zueinander angeordnete Stecker für vier einzelne Kraftstoffeinspritzventile 1 auf. Zu den einzelnen Steckern 9 führen elektrische Leitungen 20, die entweder von einem gestrichelt dargestellten und an der Kontaktierungsleiste angeordneten Anschlußstecker 21 ausgehen oder zu einem Kabelstrang 22 führen, der entweder über eine nicht dargestellte Steckverbindung oder direkt mit dem elektronischen Steuergerät 8 verbunden ist. Über den Anschlußstecker 21 kann ebenfalls eine Steckverbindung mit einem gestrichelt dargestellten Gegenstecker 23 hergestellt werden, der mit dem Kabelstrang 22 verbunden ist. Die axialen Abstände und die Lage der Stecker 9 zueinander an der Kontaktierungsleiste richten sich nach den Abständen und der Lage der Kraftstoffeinspritzventile 1 an der Brennkraftmaschine.In the first exemplary embodiment of a device for the electrical contacting of electromagnetically actuated fuel injection valves 1 according to FIGS. 1 to 3, four fuel injection valves 1 are inserted into stepped receiving openings 2 of individual intake pipes or on cylinders 3 immediately before the inlet valves of mixture-compression-ignition spark-ignition internal combustion engines. Averted from the injection end of the fuel injection valve 1, not shown, the fuel injection valve has a head end 4, from which contact pins 5, generally two, protruding as first electrically conductive contact elements protrude. The contact pins 5 extend approximately in the direction of the longitudinal axis 6 of the fuel injection valve 1 and are electrically conductively connected to a magnet coil, not shown. The contact pins 5 preferably have a rectangular cross section. The electrical connection of each individual fuel injection valve to an electronic control unit 8 is made via plug 9, each Fuel injector 1 is assigned a connector 9. The fuel injection valves 1 and the control unit 8 are components of a fuel injection system in which the quantity of fuel injected via the fuel injection valves 1 is dependent on the operating parameters of the internal combustion engine, such as intake air quantity 10, load 11, temperature 12 and others, which are input as a function of the electronic control unit 8. According to the invention, the plugs 9 are arranged on a common contact strip 14, which can be made completely flat or, for example, have a trough-like shape according to the drawings and can be made of sheet metal. In the trough-shaped configuration of the contact strip 14, an edge region 15 on the circumference of the entire contact strip is bent approximately at right angles to a flat inner region 16. This bent edge region 1 can also only extend over a partial region of the circumference of the contact strip, for example only over one or both edge regions on the narrow sides of the contact strip or over one or both edge regions on the longitudinal sides of the contact strip 14. The contact strip can be made of metal, plastic or Ceramic exist and has mounting holes 17 through which screws 18 can be inserted and screwed into the wall of the internal combustion engine for fastening the contact strip to the internal combustion engine. The contact strip 14 shown has an elongated straight shape, but the contact strip could also have a curved shape in the longitudinal direction if the fuel injection valves are not arranged in a line one behind the other. The contact strip 14 shown has four plugs for four individual fuel injection valves 1 arranged at a distance from one another in the axial direction of the contact strip. Electrical lines 20 lead to the individual plugs 9, which either start from a connecting plug 21 shown in dashed lines and arranged on the contact strip, or lead to a cable harness 22 which either has a plug connection (not shown) or is directly connected to the electronic control unit 8. A plug connection with a mating connector 23, shown in dashed lines, which is connected to the cable harness 22, can likewise be produced via the connector plug 21. The axial distances and the position of the connectors 9 to one another on the contact strip depend on the distances and the position of the fuel injection valves 1 on the internal combustion engine.

Durch die an der gemeinsamen Kontaktierungsleiste 14 angeordneten Stecker 9 ist bei der Montage eine gleichzeitige Herstellung einer Steckverbindung zwischen allen Kraftstoffeinspritzventilen 1 und den Steckern 9 möglich. Nach dem vorliegenden Ausführungsbeispiel wird jeder Stecker 9 aus einem ersten Steckerteil 25 und einem zweiten Steckerteil 26 gebildet. Das zweite Steckerteil 26 weist einen sich in Richtung der Längsachse 6 erstreckenden Ansatz 27 auf, der durch eine Steckeröffnung 28 im Innenbereich 16 der Kontaktierungsleiste 14 hindurchgreift und in eine Aufnahmeöffnung 29 des andererseits der Kontaktierungsleiste 14 angeordneten ersten Steckerteils 25 hineinragt. Der Kontaktierungsleiste 14 zugewandt weist das erste Steckerteil 25 in das Innere der Aufnahmeöffnung 29 ragende Rastnasen 30 auf, die bei der Montage mit dem zweiten Steckerteil 26 in eine Rastnut 31 am Ansatz 27 des zweiten Steckerteiles 26 einrasten und somit das erste Steckerteil 25 und das zweite Steckerteil 26 in axialer Richtung zueinander fixieren. Es ist natürlich auch eine andere Befestigungsart der beiden Steckerteile 25, 26 aneinander denkbar, beispielsweise könnten die Rastnasen am Ansatz 27 und die Rastnut könnte am ersten Steckerteil 25 ausgebildet sein. In diesem Zustand stützt sich eine Anschlagnase 33 des Bodens 34 der topfförmigen Aufnahmeöffnung 29 an der Stirnfläche 35 des Ansatzes 27 ab und zwischen dem Boden 34 und der Stirnfläche 35 wird ein die Anschlagnase umgebender Steckerdichtring 36 verspannt. Das erste Steckerteil 25 und das zweite Steckerteil 26 sind vorteilhafterweise aus Kunststoff gefertigt und haften oder klemmen zwischen sich die Kontaktierungsleiste 14, wozu die beiden Steckerteile die Steckeröffnung 28 nach außen hin überragen, wobei gegebenenfalls in axialer Richtung durchaus zwischen den Steckerteilen und der Kontaktierungsleiste ein Spiel vorhanden sein kann. In dem ersten Steckerteil 25 sind zweite elektrisch leitende Kontaktelemente 37 mit ihrem einen Ende eingegossen, deren andere Enden innerhalb des Steckerdichtringes liegend in die Aufnahmeöffnung 29 ragen und auf die Kontaktstifte 5 ausgerichtet sind, die sie teilweise unter Herstellung einer elektrisch leitenden Verbindung umgreifen. Die zweiten elektrisch leitenden Kontaktelemente sind dabei innerhalb des ersten Steckerteiles 25 elektrisch leitend mit je einer elektrischen Leitung 20 verbunden und sind vorteilhafterweise anderen Endes als sogenannte Flachstecker ausgebildet. Im montierten Zustand umgreift das zweite Steckerteil 26 mit einer beispielsweise rechteckförmig ausgebildeten Übergreiföffnung 38 das zumindest ebenfalls teilweise mit einem rechteckförmigen Querschnitt versehene Kopfende 4 und stützt sich mit seiner Steckerstirnfläche 39 an einem Bund 40 des Kraftstoffeinspritzventiles 1 ab, der andererseits auf diese Weise gegen einen Rand 41 der gestuften Aufnahmeöffnung 2 gepreßt wird, wodurch das Kraftstoffeinspritzventil in axialer Richtung fixiert wird. Der Bund 40 kann auch an einem Zwischenring 42 ausgebildet sein, wie er in Figur 3 dargestellt ist, und der mit einer Zentralöffnung 43 das Kopfende 4 umgreifend am Kraftstoffeinspritzventil 1 anliegt. Im auf das Kopfende 4 des Kraftstoffeinspritzventiles 1 aufgesteckten Zustand des Steckers 9 ragen die Kontaktstifte 5 von der einen Seite und die Flachstecker 37 von der anderen Seite in je eine von der Übergreiföffnung 38 zur Stirnfläche 35 des Ansatzes 27 verlaufenden Durchgangsöffnung 44 und stellen eine elektrisch leitende Steckverbindung her. Die Durchgangsöffnungen 44 haben in etwa den gleichen Abstand zueinander, wie die Kontaktstifte 5. Die Abdichtung zwischen dem Stecker 9 und der Aufnahmeöffnung 2 kann durch einen Dichtring 45 erfolgen, der in eine Umfangsnut 52 des zweiten Steckerteiles 26 eingelegt ist und an der Wandung der Aufnahmeöffnung 2 unter Spannung anliegt.Due to the connector 9 arranged on the common contact strip 14, a simultaneous establishment of a plug connection between all fuel injection valves 1 and the connectors 9 is possible during assembly. According to the present exemplary embodiment, each plug 9 is formed from a first plug part 25 and a second plug part 26. The second plug part 26 has an extension 27 extending in the direction of the longitudinal axis 6, which extends through a plug opening 28 in the inner region 16 of the contact strip 14 and projects into a receiving opening 29 of the first plug part 25 arranged on the other side of the contact strip 14. Facing the contacting strip 14, the first plug part 25 has latching lugs 30 which protrude into the interior of the receiving opening 29 and which engage during assembly with the second plug part 26 in a latching groove 31 on the shoulder 27 of the second plug part 26 and thus the first plug part 25 and the second Fix plug part 26 to each other in the axial direction. Another type of fastening of the two plug parts 25, 26 to one another is of course also conceivable, for example the latching lugs on the extension 27 and the latching groove could be formed on the first plug part 25. In this state, a stop lug 33 of the base 34 of the cup-shaped receiving opening 29 is supported on the end face 35 of the shoulder 27 and a plug sealing ring 36 surrounding the stop lug 36 is clamped between the base 34 and the end face 35. The first plug part 25 and the second plug part 26 are advantageously made of plastic and adhere or clamp the contact strip between them 14, for which purpose the two connector parts protrude beyond the connector opening 28, with play possibly being present in the axial direction between the connector parts and the contact strip. In the first connector part 25, second electrically conductive contact elements 37 are cast in at one end, the other ends of which, lying inside the connector sealing ring, protrude into the receiving opening 29 and are aligned with the contact pins 5, which partially encompass them to produce an electrically conductive connection. The second electrically conductive contact elements are connected within the first plug part 25 in an electrically conductive manner to one electrical line 20 each and are advantageously designed at other ends as so-called flat plugs. In the assembled state, the second plug part 26, with an overlapping opening 38, for example, of rectangular design, engages around the head end 4, which is also at least partially provided with a rectangular cross section, and is supported with its plug end face 39 on a collar 40 of the fuel injection valve 1, which on the other hand in this way bears against an edge 41 of the stepped receiving opening 2 is pressed, whereby the fuel injection valve is fixed in the axial direction. The collar 40 can also be formed on an intermediate ring 42, as shown in FIG. 3, which, with a central opening 43, lies around the head end 4 on the fuel injection valve 1. When the plug 9 is plugged onto the head end 4 of the fuel injection valve 1, the contact pins 5 protrude from one side and the flat plug 37 from the other side into a passage opening 44, which extends from the overlap opening 38 to the end face 35 of the extension 27, and provide an electrically conductive one Connector. The through openings 44 are at approximately the same distance from one another as the contact pins 5. The seal between the plug 9 and the receiving opening 2 can be provided by a sealing ring 45 which is inserted into a circumferential groove 52 of the second connector part 26 and on the wall of the receiving opening 2 is under voltage.

Bei dem zweiten Ausführungsbeispiel nach Figur 4 sind die gegenüber dem ersten Ausführungsbeispiel nach den Figuren 1 bis 3 gleichbleibenden und gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet. Die Kontaktierungsleiste 46 und die Stecker 9 sind bei dem zweiten Ausführungsbeispiel nach Figur 4 als ein gemeinsamen Teil aus Kunststoff gefertigt, z.b. als Spritzgußteil. Dabei ist die Kontaktierungsleiste 46 ebenfalls langgestreckt ausgebildet. Wie in den Figuren 6 und 7 beispielsweise dargestellt ist, sind verschiedene Querschnitte der Kontaktierungsleiste 46 möglich. Entsprechend Figur 6 kann die Kontaktierungsleiste 46 eine umlaufende ebene Grundplatte 47 aufweisen, die in ihrem mittleren Bereich in Einspannabschnitte 48 und Steckerabschnitte 49 übergeht. Die Einspannabschnitte 48 und die Steckerabschnitte 49 erheben sich jeweils auf der den Kraftstoffeinspritzventilen 1 abgewandten Seite über die Grundplatte 47 hinaus. So ist beispielsweise jeder Einspannabschnitt 48 wannenförmig ausgebildet, mit einem der Grundplatte 47 zugewandten kreuzförmigen Spannboden 50, der bei ausreichender Festigkeit möglichst wenig Material benötigt und durch dessen Befestigungslöcher 17 die Schrauben 18 zur Einspannung der Kontaktierungsleiste 46 einführbar sind. Der beispielsweise kreuzförmige Spannboden 50 kann einen das Befestigungsloch 17 aufnehmenden kreisförmigen Mittelbereich aufweisen, von dem sternförmig beispielsweise vier Stege unter Bildung von Aussparungen 51 zur Grundplatte 47 hin verlaufen. Jeder wannenförmige Einspannabschnitt 48 weist von der Grundplatte 47 fortführende Seitenwände 53 auf, in denen zumindest teilweise von der Leistenstirnfläche 60 ausgehende Schlitze 54 ausgespart sind, durch die elektrische Leitungen 20 zu den einzelnen Steckern 9 bzw. zweiten elektrisch leitenden Kontaktelementen 37 der Stecker 9 geführt sind. Die elektrischen Leitungen 20 können als Runddraht oder bandförmige Kontaktschienen ausgebildet sein, wie beispielsweise im Querschnitt in den Figuren 6 und 8 dargestellt ist. Bei dem Ausführungsbeispiel nach Figur 4 sind die elektrischen Leitungen 20 so angeschlossen, daß die einzelnen Kraftstoffeinspritzventile 1 elektrisch parallel geschaltet sind, so daß alle durch die Kontaktierungsleiste 46 kontaktierten Kraftstoffeinspritzventile 1 gleichzeitig erregbar sind. Die elektrischen Leitungen 20 können, wie bereits zu Figur 1 ausgeführt wurde, als Einzelleitungen aus der Kontaktierungsleiste 46 herausgeführt werden und als Kabelstrang 22 zum elektronischen Steuergerät 8 führen, oder entsprechend der Darstellung in Figur 5 und der Beschreibung zu Figur 1 mit einem an der Kontaktierungsleiste 46 angeformten Anschlußstecker 21 in Verbindung stehen. Die auch als elektrische Leitungen dienenden bandförmigen Kontaktschienen 20 können im Bereich der Stecker 9 als zweite Kontaktelemente 37 in Form von Flachsteckern ausgebildet sein, indem dieser Bereich der Kontaktschiene in einem Biegeverfahren zu einem Flachstecker geformt wird, dessen Querschnitt eine U-Form aufweist mit Schenkeln, die in Richtung zu den Kontaktstiften 5 hin offen sind und diesen unter Spannung teilweise umgreifen. Zweckmäßigerweise ist dabei der Kontaktstift 5 mit einem rechteckförmigen Querschnitt versehen. Dem offenen Ende des Flachsteckers 37 abgewandt weist der Flachstecker eine Durchstecköffnung 55 auf, die zweckmäßigerweise bei einem rechteckigen Kontaktstift 5 ebenfalls rechteckförmig ausgebildet ist und ein Hindurchstecken des Kontaktstiftes 5 ermöglicht, wobei in Längsrichtung die Durchstecköffnung 55 wesentlich länger ausgebildet ist als der Kontaktstift, um genügend Spiel als Toleranzausgleich zur Verfügung zu haben. Die elektrischen Leitungen 20 können auch in Leitungsnuten 56 der Grundplatte 47 (siehe Figur 6) geführt sein. Stützstege 57 von der Grundplatte 47 zu den Seitenwänden 53 oder zum Stecker 9 verlaufend gewährleisten eine ausreichende Steifigkeit der Kontaktierungsleiste 46.In the second exemplary embodiment according to FIG. 4, the parts which remain the same and have the same effect as in the first exemplary embodiment according to FIGS. 1 to 3 are identified by the same reference numerals. The contact strip 46 and the plug 9 are made in the second embodiment of Figure 4 as a common part made of plastic, for example as an injection molded part. The contact bar 46 is also elongated. As shown in FIGS. 6 and 7, for example, different cross sections of the contact strip 46 are possible. According to FIG. 6, the contacting strip 46 can have a circumferential, flat base plate 47, which in its central region merges into clamping sections 48 and plug sections 49. The clamping sections 48 and the plug sections 49 each rise above the base plate 47 on the side facing away from the fuel injection valves 1. For example, each clamping section 48 is trough-shaped, with a cruciform clamping base 50 facing the base plate 47, which, with sufficient strength, requires as little material as possible and through the fastening holes 17 of which the screws 18 for clamping the contact strip 46 can be inserted. The, for example, cross-shaped clamping base 50 can have a circular central region that receives the fastening hole 17, from which four webs, for example, run in a star shape, with the formation of recesses 51 toward the base plate 47. Each trough-shaped clamping section 48 has side walls 53 extending from the base plate 47, in which at least partially slots 54 extending from the end face 60 of the ledge are recessed, through which electrical lines 20 lead to the individual plugs 9 or second electrically conductive contact elements 37 of the plugs 9 . The electrical lines 20 can be designed as round wire or band-shaped contact rails, as is shown, for example, in cross section in FIGS. 6 and 8. In the exemplary embodiment according to FIG. 4, the electrical lines 20 are connected in such a way that the individual fuel injection valves 1 are electrical are connected in parallel, so that all fuel injection valves 1 contacted by the contacting strip 46 can be excited simultaneously. As already explained for FIG. 1, the electrical lines 20 can be led out of the contact strip 46 as individual lines and lead to the electronic control unit 8 as a cable harness 22, or according to the illustration in FIG. 5 and the description of FIG. 1 with one on the contact strip 46 molded connector 21 are connected. The band-shaped contact rails 20, which also serve as electrical lines, can be formed in the region of the plugs 9 as second contact elements 37 in the form of flat plugs, in that this region of the contact rail is shaped into a flat plug in a bending process, the cross section of which has a U-shape with legs, which are open in the direction of the contact pins 5 and partially grip them under tension. The contact pin 5 is expediently provided with a rectangular cross section. The flat plug, facing away from the open end of the flat plug 37, has a push-through opening 55, which is expediently also rectangular in shape in the case of a rectangular contact pin 5 and enables the contact pin 5 to be pushed through, the push-through opening 55 being designed in the longitudinal direction to be sufficiently longer than the contact pin, by sufficient Game available as tolerance compensation. The electrical lines 20 can also be guided in line grooves 56 of the base plate 47 (see FIG. 6). Support webs 57 running from the base plate 47 to the side walls 53 or to the plug 9 ensure sufficient rigidity of the contact strip 46.

Entsprechend den Erfordernissen wechseln sich Einspannabschnitte 48 und Steckerabschnitte 49 der Kontaktleiste 46 ab. In Figur 7 ist beispielsweise ein Querschnitt durch einen Steckerabschnitt 49 dargestellt, der sich topfförmig aus der Grundplatte 47 wie die Seitenwände 53 erhebt und mit einer Auswölbung 59 das Kopfende 4 des Kraftstoffeinspritzventiles 1 umgreift, das in die sacklochförmig ausgebildete Übergreiföffnung 38 der Auswölbung 59 hinein ragt und dort mit seinen Kontaktstiften 5 in die Flachstecker 37 eingreift, die mit den elektrischen Leitungen 20 verbunden in den Steckern 9 innerhalb der Übergreiföffnung 38 gehalten werden. Die elektrischen Leitungen können ebenfalls im Bereich der Steckerabschnitte 49 in in den Wandungen des Steckerabschnittes ausgebildeten Schlitzen 54 oder Leitungsnuten 56 geführt werden. Im Bereich der Steckerabschnitte 49 gehen die Seitenwände 53 der Einspannabschnitte 48 in die Auswölbung 59 über. Die Grundplatte 47 weist an ihrer der Auswölbung 59 abgewandten Leistenstirnfläche 60 eine Vertiefung 61 auf, mit der die Kontaktierungsleiste 46 den Bund 40 übergreift und, wie oben bereits zu dem ersten Ausführungsbeispiel beschrieben, hierdurch das Kraftstoffeinspritzventil 1 in axialer Richtung zur Fixierung verspannt. Die Vertiefung 61 ist wie auch eine an der Leistenstirnfläche 60 ausgebildete Ringnut 62 zum Einzelsaugrohr bzw. Zylinder 3 hin offen. In die Ringnut 62 ist ein Dichtring 63 eingelegt, der in der Grundplatte 47 verlaufend bei mittels der Schrauben 18 angeschraubter Kontaktierungsleiste 46 zwischen der Kontaktierungsleiste 46 und den Einzelansaugrohren bzw. Zylindern 3 zu den Kraftstoffeinspritzventilen 1 hin abdichtet.Depending on the requirements, clamping sections 48 and plug sections 49 of the contact strip 46 alternate. FIG. 7 shows, for example, a cross section through a plug section 49, which rises from the base plate 47 in a pot-shaped manner, like the side walls 53, and with a bulge 59 the head end 4 of the Grips around fuel injection valve 1, which projects into the blind hole-shaped overlap opening 38 of the bulge 59 and engages there with its contact pins 5 in the tabs 37, which are connected to the electrical lines 20 and held in the plugs 9 within the overlap opening 38. The electrical lines can likewise be routed in the region of the plug sections 49 in slots 54 or line grooves 56 formed in the walls of the plug section. In the area of the plug sections 49, the side walls 53 of the clamping sections 48 merge into the bulge 59. The base plate 47 has on its ledge end face 60 facing away from the bulge 59, a recess 61 with which the contact strip 46 engages over the collar 40 and, as already described above for the first exemplary embodiment, thereby braces the fuel injection valve 1 in the axial direction for fixing. The depression 61, like an annular groove 62 formed on the strip end face 60, is open toward the individual intake pipe or cylinder 3. In the annular groove 62, a sealing ring 63 is inserted, which extends in the base plate 47 with the contact strip 46 screwed by means of the screws 18 between the contact strip 46 and the individual intake pipes or cylinders 3 to the fuel injection valves 1.

Das dritte Ausführungsbeispiel einer erfindungsgemäßen Kontaktierungsleiste 46 verwendet die gleichen Bezugszeichen für gleichwirkende und gleiche Teile, wie sie bisher für die vorhergehenden Ausführungsbeispiele verwendet wurden. Die ebenfalls aus Kunststoff gemeinsam mit den Steckern 9 gefertigte Kontaktierungsleiste 46, die in den Querschnitten von Einspannabschnitt 48 und Steckerabschnitt 49 ebenfalls Querschnitte entsprechend den Figuren 6 und 7 aufweist, unterscheidet sich lediglich durch die Anbringung eines Anschlußsteckers 21 und die Führung der elektrischen Leitungen 20 von dem zweiten Ausführungsbeispiel nach Figur 4. Bei dem dritten Ausführungsbeispiel nach Figur 5 sind die elektrischen Leitungen 20 so geführt, daß die durch die Kontaktierungsleiste 46 kontaktierten Kraftstoffeinspritzventile 1 nacheinander oder in Gruppen durch das elektronische Steuergerät erregbar sind.The third exemplary embodiment of a contacting strip 46 according to the invention uses the same reference symbols for identical and identical parts as have been used for the previous exemplary embodiments. The contact strip 46, which is also made of plastic together with the plugs 9 and which also has cross sections corresponding to FIGS. 6 and 7 in the cross sections of the clamping section 48 and plug section 49, differs only in the attachment of a connecting plug 21 and the routing of the electrical lines 20 from the second exemplary embodiment according to FIG. 4. In the third exemplary embodiment according to FIG. 5, the electrical lines 20 are guided in such a way that those contacted by the contact strip 46 Fuel injection valves 1 can be excited in succession or in groups by the electronic control unit.

Bei dem vierten Ausführungsbeispiel nach den Figuren 9 bis 12 sind die gegenüber den bisherigen Ausführungsbeispielen gleichbleibenden und gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet. Bei diesem Ausführungsbeispiel ist die Kontaktierungsleiste 70 aus Kunststoff gefertigt, z.B. äls Spritzgußteil. Die Kontaktierungsleiste 70 ist lang gestreckt ausgebildet und weist mit Abstand zueinander erhaben angeformte Hauben 71 auf, die ein Gehäuse für jeden Stecker 9 bildend je eine sacklochförmige Steckeröffnung 72 haben. Die Hauben 71 ragen aus einer Grundplatte 73 der Kontaktierungsleiste 70 heraus. Zwischen den Hauben 71 erstreckt sich in Längsrichtung der Kontaktierungsleiste 70 eine Versteifungsrippe 74. Den Hauben 71 und der Versteifungsrippe 74 abgewandt verläuft innerhalb der Kontaktierungsleiste 70 eine zur Leistenstirnfläche 75 hin, mit der die Kontaktierungsleiste an der Brennkraftmaschine anliegt, offene Längsnut 76, die die einzelnen Steckeröffnungen 72 schneidet und miteinander verbindet. Die Steckeröffnungen 72 sind zur Längsnut 76 und der Leistenstirnfläche hin offen. In einer Ringnut 62 der Leistenstirnfläche 75 kann ein Dichtring 63 angeordnet sein, der sich an einer geeigneten Anlagefläche der Brennkraftmaschine abstützt, so daß die Längsnut 76 im wesentlichen nach außen hin abgedichtet ist. Die Befestigung der Kontaktierungsleiste 70 an der Brennkraftmaschine erfolgt mittels Schrauben 18. Hierfür weist die Kontaktierungsleiste mit Abstand zueinander Befestigungslöcher 17 auf, in die eine Zentrierbuchse 78 eingesetzt sein kann, die in eine Zentrieröffnung 79 der Brennkraftmaschine mit engem Spiel ragt. In eine Schraubenöffnung 80 der Zentrierbuchse 78 ist die Schraube 18 eingesetzt und mit einer Gewindebohrung 81 der Brennkraftmaschine verschraubt. In Figur 9 sind vier Schrauben 18 an der Kontaktierungsleiste vorgesehen und vier Stecker 9.In the fourth exemplary embodiment according to FIGS. 9 to 12, the parts that remain the same and function the same as in the previous exemplary embodiments are identified by the same reference numerals. In this embodiment, the contact strip 70 is made of plastic, for example as an injection molded part. The contact strip 70 is elongated and has spaced-apart molded hoods 71 which each have a blind hole-shaped connector opening 72 forming a housing for each connector 9. The hoods 71 protrude from a base plate 73 of the contact strip 70. A stiffening rib 74 extends between the hoods 71 in the longitudinal direction of the contacting strip 70. Averted from the hoods 71 and the stiffening rib 74, a longitudinal groove 76 extends inside the contacting strip 70 towards the strip end face 75, with which the contacting strip rests on the internal combustion engine, which the individual Plug openings 72 cuts and connects together. The plug openings 72 are open to the longitudinal groove 76 and the strip end face. A sealing ring 63 can be arranged in an annular groove 62 of the strip end face 75, which is supported on a suitable contact surface of the internal combustion engine, so that the longitudinal groove 76 is essentially sealed off from the outside. The contacting strip 70 is fastened to the internal combustion engine by means of screws 18. For this purpose, the contacting strip has mounting holes 17 at a distance from one another, into which a centering bushing 78 can be inserted, which projects into a centering opening 79 of the internal combustion engine with tight play. The screw 18 is inserted into a screw opening 80 of the centering bushing 78 and screwed to a threaded bore 81 of the internal combustion engine. In FIG. 9, four screws 18 are provided on the contact strip and four plugs 9.

Beim Anschrauben der Kontaktierungsleiste 70 an der Brennkraftmaschine kann die Leistenstirnfläche 75 dazu dienen an dem Bund 40 jedes Kraftstoffeinspritzventiles 1 anzugreifen und jedes Kraftstoffeinspritzventil in axialer Richtung zu verspannen.When the contact strip 70 is screwed onto the internal combustion engine, the strip end face 75 can serve to engage the collar 40 of each fuel injection valve 1 and to brace each fuel injection valve in the axial direction.

Zur Längsnut 76 hin offen sind ebenfalls in Längsrichtung der Kontaktierungsleiste 70 verlaufende Kontaktschienennuten 82 vorgesehen, die die einzelnen Steckeröffnungen 72 schneiden und symmetrisch zur Leistenachse 83 verlaufen. Die beiden Kontaktschienennuten 82 dienen der Aufnahme und Führung je einer als elektrische Leitung dienenden bandförmigen Kontaktschiene 85. Jede Kontaktschiene 85 steht über den Anschlußstecker 21 mit dem elektronischen Steuergerät in Verbindung. Wie in Figur 10 in den beiden rechten Steckeröffnungen 72 und in Figur 12 in geändertem Maßstab gezeigt, ist jede Kontaktschiene 85 aus ihrer Bandebene heraus unter Bildung von einzelnen Bögen 86 mäanderförmig gebogen, so daß jeder Bogen 86 in eine Steckeröffnung 72 ragt. Dabei kann jeder Bogen 86 mit Ausgleichswölbungen 87 versehen sein, die einen gewissen Längenausgleich gewährleisten. Im Bereich der Stecker 9 ist jeder Bogen 86 mit einem als zweites Kontaktelement dienenden Flachstecker 37 elektrisch leitend verbunden, z.B. verschweißt, verklemmt oder verlötet.Open to the longitudinal groove 76 are also provided in the longitudinal direction of the contact strip 70 contact rail grooves 82 which intersect the individual plug openings 72 and run symmetrically to the strip axis 83. The two contact rail grooves 82 each serve to receive and guide a band-shaped contact rail 85 serving as an electrical line. Each contact rail 85 is connected to the electronic control unit via the connector plug 21. As shown in FIG. 10 in the two right-hand plug openings 72 and in FIG. 12 on a different scale, each contact rail 85 is bent out of its band plane to form individual arches 86, so that each arch 86 projects into a plug opening 72. Each arch 86 can be provided with compensating arches 87 which ensure a certain length compensation. In the area of the plug 9, each bend 86 is electrically conductively connected to a flat plug 37 serving as a second contact element, e.g. welded, jammed or soldered.

In jede Steckeröffnung 72 ist zur Bildung je eines Steckers 9 ein Einsatzkörper 88 eingesetzt, der mit einer Haube 71 durch eine Schraube oder eine Rastverbindung verbunden sein kann. In Figur 9 ist lediglich ein Einsatzkörper 88 in der zweiten Steckeröffnung 72 von links dargestellt, und in Figur 10 ist lediglich in der ersten und der zweiten Steckeröffnung 72 von links je ein Einsatzkörper gezeigt. Jeder Einsatzkörper 88 weist Führungsnuten 89 auf, die sich etwa parallel zur Steckerlängsachse 6 erstrecken und je einen Bogen 86 der Kontaktschienen 85 führen. Außerdem weist jeder Einsatzkörper 88 entsprechend der erforderlichen Anzahl der Flachstecker 37 Halteöffnungen 90 auf, die jeden Einsatzkörper 88 in Richtung der Steckerlängsachse kerlängsachse 6 durchdringen und zur Halterung der Flachstecker 37 dienen. Beim vorliegenden Ausführungsbeispiel sind zwei Halteöffnungen 90 zur Aufnahme von je einem Flachstecker 37 im Einsatzkörper 88 vorgesehen, so daß jeder Kontaktstift 5 jedes Kraftstoffeinspritzventiles 1 mit einem der Flachstecker 37 elektrisch in Verbindung gebracht werden kann.In each connector opening 72, an insert body 88 is inserted to form a connector 9, which can be connected to a hood 71 by a screw or a snap connection. In FIG. 9, only one insert body 88 is shown in the second connector opening 72 from the left, and in FIG. 10, only one insert body is shown in the first and the second connector opening 72 from the left. Each insert body 88 has guide grooves 89 which extend approximately parallel to the longitudinal axis 6 of the plug and each lead an arc 86 of the contact rails 85. In addition, each insert body 88 has 37 holding openings 90 corresponding to the required number of tabs, which each insert body 88 in the direction of the connector longitudinal axis penetrate the longitudinal axis 6 and serve to hold the tab 37. In the present exemplary embodiment, two holding openings 90 are provided for receiving a flat plug 37 in the insert body 88, so that each contact pin 5 of each fuel injection valve 1 can be electrically connected to one of the flat plugs 37.

Die Kontaktierungsleiste 70 ermöglicht, wie bereits zu den weiteren Ausführungsbeispielen beschrieben, die gleichzeitige Herstellung einer Steckverbindung zwischen allen Kraftstoffeinspritzventilen 1 und den Steckern 9.As already described for the further exemplary embodiments, the contacting strip 70 enables the simultaneous establishment of a plug connection between all fuel injection valves 1 and the plugs 9.

Claims (21)

  1. Device comprising at least two electromagnetically actuable fuel injection valves (1) of a fuel injection system for an internal combustion engine, the said valves having first electrically conductive contact elements (5), and further comprising second electrically conductive contact elements (37) which are arranged in at least two plugs (9) and with which the first electrically conductive contact elements (5) can be brought into plug-in connection and which can be connected to an electronic control unit (8) of the fuel injection system via a connection plug (21), characterized in that only the plugs (9), of which there are at least two, and electrical conductors (20, 85) connecting these and the connection plugs (21) are arranged on a common independent contact strip (14, 46, 70).
  2. Device according to Claim 1, characterized in that the contact strip (14, 46, 70) can be mounted on the internal combustion engine (3).
  3. Device according to Claim 1 or 2, characterized in that each plug (9) is formed by a first plug part (25, 71) and a second plug part (26, 88), which can be connected to one another.
  4. Device according to Claim 3, characterized in that one of the plug parts (25, 26) has, in the axial direction, an extension (27) which reaches through a plug opening (28) in the contact strip (14) and projects into the other plug part (25, 26).
  5. Device according to Claim 4, characterized in that the contact strip (14) is inserted between the two plug parts (25, 26).
  6. Device according to Claim 3, characterized in that the two plug parts (25, 26, 71, 88) can be connected to one another by a latching connection (30, 31).
  7. Device according to Claim 3, characterized in that the plug part (26) adjacent to the fuel injection valve (1) exerts a force on the fuel injection valve (1) for the axial fixing of the fuel injection valve (1).
  8. Device according to Claim 1 or 2, characterized in that the plugs (9) are formed on the contact strip (46, 70), which is produced from plastic.
  9. Device according to Claim 8, characterized in that the second contact elements (37) are connected in the plugs (9) to electrical conductors (20, 85) guided in the contact strip (46, 70).
  10. Device according to Claim 9, characterized in that the electrical conductors (20, 85) are constructed at least in part as strip-shaped contact rails.
  11. Device according to Claim 10, characterized in that the strip-shaped contact rails (20, 85) are provided in the region of the plugs (9) with the second contact elements (37), which are constructed as push-on blades and into which the first contact elements (5) of the fuel injection valves (1) engage.
  12. Device according to Claim 8, characterized in that the contact strip (46, 70) exerts a force on the fuel injection valve (1) for the axial fixing of the fuel injection valve (1).
  13. Device according to Claim 1, characterized in that a connection plug (21) connected to the second electrically conductive contact elements (37) of the plugs (9) is arranged on the contact strip (14, 46, 70).
  14. Device according to Claim 1, characterized in that the contact strip (70) is produced from plastic and, at a distance from one another, has integrally moulded raised covers (71) which each have a plug opening (72) in the form of a blind hole which forms a housing for the plugs (9) and into each of which is inserted an insert by means of which the second contact elements (37) are held.
  15. Device according to Claim 14, characterized in that the second contact elements (37) are connected in electrically conductive fashion in the plugs (9) to electrical conductors (85) guided in the contact strip (70).
  16. Device according to Claim 15, characterized in that the electrical conductors are constructed as strip-shaped contact rails (85) in the contact strip (70).
  17. Device according to Claim 16, characterized in that the second contact elements are constructed as push-on blades (37).
  18. Device according to Claim 16, characterized in that each strip-shaped contact rail (85) is bent in a meander shape out of its strip plane, forming bends (86), and each bend (86) projects into a plug opening (72).
  19. Device according to Claim 18, characterized in that each bend (86) runs between the wall of the insert (88) and the wall of the plug opening (72).
  20. Device according to Claim 14, characterized in that the contact strip (70) can be mounted on the internal combustion engine and, in the process, exerts a force on each fuel injection valve (1) for the axial fixing of the fuel injection valve (1).
  21. Device according to Claim 14, characterized in that a connection plug (21) connected to the second electrically conductive contact elements (37) of the plugs (9) via electrical conductors (85) is arranged on the contact strip (70).
EP88100240A 1987-02-06 1988-01-11 Device for electrically contacting electromagnetically activated fuel injectors Expired - Lifetime EP0278229B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3703592 1987-02-06
DE3703592 1987-02-06
DE3725980 1987-08-05
DE3725980A DE3725980C2 (en) 1987-02-06 1987-08-05 Device for the electrical contacting of electromagnetically actuated fuel injection valves

Publications (3)

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EP0278229A2 EP0278229A2 (en) 1988-08-17
EP0278229A3 EP0278229A3 (en) 1990-02-28
EP0278229B1 true EP0278229B1 (en) 1995-01-04

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EP88100240A Expired - Lifetime EP0278229B1 (en) 1987-02-06 1988-01-11 Device for electrically contacting electromagnetically activated fuel injectors

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US (1) US4857003A (en)
EP (1) EP0278229B1 (en)
JP (1) JP2583550B2 (en)
AU (1) AU595084B2 (en)
BR (1) BR8800471A (en)
ES (1) ES2066764T3 (en)

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Also Published As

Publication number Publication date
US4857003A (en) 1989-08-15
EP0278229A3 (en) 1990-02-28
AU8285087A (en) 1988-08-11
JPH01203648A (en) 1989-08-16
AU595084B2 (en) 1990-03-22
JP2583550B2 (en) 1997-02-19
ES2066764T3 (en) 1995-03-16
EP0278229A2 (en) 1988-08-17
BR8800471A (en) 1988-09-20

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